Comparing: Waffenträger auf E 100 vs. Object 263 vs. Object 268

A proposal to mount a large-caliber antiaircraft gun on the chassis of the E 100 tank. The vehicle was to feature either 128- or 150-mm guns with an automatic loading system. However, the design project was never developed.

The development of a heavy tank destroyer on the basis of the IS-7 heavy tank was started in 1950. Three design projects were developed, one of which resulted in a full-size wooden prototype. However, further development was discontinued due to phasing out the IS-7 mass-production.

Development of the Object 268 was started in the summer of 1952 at the Kirov Plant, Leningrad, under the supervision of Joseph Kotin. The vehicle was developed on the basis of the T-10 heavy tank. A prototype was manufactured in 1956. The vehicle passed trials, but never saw mass production.